Ключевые слова: accessory, back, background, black, centimeter, class, college, copy, design, education, element, equipment, eraser, flat, geometry, grey, item, kid, knowledge, lay, learn, learning, length, lesson, light, math, measure, measurement, measuring, millimeter, nobody, object, office, pencil, plastic, pupil, ruler, school, space, stationery, student, study, studying, supply, text, tool, top, university, view, work,